Confused demonyms notwithstanding, Romans from Mars is a fairly straightforward iOS offering from Sidekick Games: waves of green-skinned centurions are attacking your ramparts and you, a lone ballista operator, are tasked with holding them off. The Roman deity Jupiter supplies intermittent spells — an earthquake here, a lightning bolt there — but the bulk of Romans from Mars consists of launching huge arrows as quickly and accurately as possible against increasingly complex hordes of aliens. Unfortunately, it devolves into mindless tapping, while the free-to-play approach makes upgrades prohibitively expensive before long.